I would like to be able to choose between alternative Linux command
lines in my GRUB menu (specifically, I want a "selinux=0" option, but I
can imagine that people might want other things). I could add an extra
script to /etc/grub.d to do this, but then I have to copy the logic in
10_linux to detect what kernel versions are available, and they do not
appear in the correct place in the menu. It would be simpler if you
could specify variant command lines in /etc/default/grub and have them
handled automatically in 10_linux.
The attached patch allows (for example) the following configuration in
/etc/default/grub:
GRUB_LINUX_VARIANTS="noselinux kms"
GRUB_CMDLINE_LINUX_noselinux="selinux=0"
GRUB_LABEL_LINUX_noselinux="SELinux disabled"
GRUB_CMDLINE_LINUX_kms="i915.modesetting=1"
GRUB_LABEL_LINUX_kms="KMS enabled"
This patch is only intended as a demonstration: various details of the
implementation still need to be sorted out, such as
internationalization. Suggestions of wildly different
approaches/configuration interfaces are welcome.
Best wishes,
--
Martin Orr
=== modified file 'util/grub-mkconfig.in'
--- util/grub-mkconfig.in 2009-12-12 00:43:32 +0000
+++ util/grub-mkconfig.in 2010-01-18 21:01:34 +0000
@@ -222,6 +222,11 @@
GRUB_GFXMODE \
GRUB_DISABLE_OS_PROBER
+export GRUB_LINUX_VARIANTS
+for i in $GRUB_LINUX_VARIANTS; do
+ export GRUB_CMDLINE_LINUX_${i} GRUB_LABEL_LINUX_${i}
+done
+
if test "x${grub_cfg}" != "x"; then
rm -f ${grub_cfg}.new
exec > ${grub_cfg}.new
=== modified file 'util/grub.d/10_linux.in'
--- util/grub.d/10_linux.in 2010-01-14 14:04:44 +0000
+++ util/grub.d/10_linux.in 2010-01-18 21:01:34 +0000
@@ -53,11 +53,15 @@
version="$2"
recovery="$3"
args="$4"
+ label="$5"
if ${recovery} ; then
title="$(gettext "%s, with Linux %s (recovery mode)")"
else
title="$(gettext "%s, with Linux %s")"
fi
+ if [ "x$label" != "x" ]; then
+ title="${title} (${label})"
+ fi
printf "menuentry \"${title}\" {\n" "${os}" "${version}"
save_default_entry | sed -e "s/^/\t/"
if [ -z "${prepare_boot_cache}" ]; then
@@ -111,11 +115,17 @@
fi
linux_entry "${OS}" "${version}" false \
- "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}"
+ "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}" ""
if [ "x${GRUB_DISABLE_LINUX_RECOVERY}" != "xtrue" ]; then
linux_entry "${OS}" "${version}" true \
- "single ${GRUB_CMDLINE_LINUX}"
+ "single ${GRUB_CMDLINE_LINUX}" ""
fi
+ for i in ${GRUB_LINUX_VARIANTS}; do
+ eval cmdline=\${GRUB_CMDLINE_LINUX_${i}}
+ eval label=\${GRUB_LABEL_LINUX_${i}}
+ linux_entry "${OS}" "${version}" false \
+ "${cmdline}" "${label}"
+ done
list=`echo $list | tr ' ' '\n' | grep -vx $linux | tr '\n' ' '`
done
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